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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e651f456a07def533218327b0360b17304a8d968fd6e22d0951182dd43ef9a99' 
  AND token = 'WcO5YJdpcyfBkcbRHxrkWfm+pxgqr0C2CKx73OxzEyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}